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Motor function under lower and higher controlled processing demands in early and continuously treated phenylketonuria
S C J Huijbregts1, L M J De Sonneville, F J Van Spronsen
1Department of Clinical Neuropsychology, Vrije Universiteit Amsterdam, The Netherlands. stephan.huijbregts@umontreal.ca
Neuropsychology
|September 10, 2003
Summary
Patients with phenylketonuria (PKU) exhibit impaired motor control, especially younger individuals. These deficits are more pronounced in complex tasks requiring advanced planning and execution, suggesting delayed maturation of motor control systems.
Area of Science:
- Neuroscience
- Developmental Psychology
- Metabolic Disorders
Background:
- Phenylketonuria (PKU) is a genetic disorder requiring lifelong dietary management.
- Early and continuous treatment aims to prevent neurological complications.
- Motor control development is crucial for overall child development.
Purpose of the Study:
- To investigate motor control abilities in early and continuously treated PKU patients.
- To compare motor control performance between PKU patients and healthy controls.
- To explore age-related differences and task-specific deficits in motor control.
Main Methods:
- A cohort of 61 early and continuously treated PKU patients and 69 controls (aged 7-14) participated.
- Motor control was assessed using a pursuit task (unpredictable movements) and a tracking task (automated movements).
- Correlations between motor control performance and historical phenylalanine levels were analyzed.
Main Results:
- PKU patients demonstrated significantly poorer motor control in both pursuit and tracking tasks compared to controls.
- Motor deficits were more severe in younger PKU patients (under 11 years).
- The pursuit task revealed greater deficits in PKU patients than the tracking task, indicating challenges with higher-level cognitive control.
Conclusions:
- Early and continuous PKU treatment does not fully normalize motor control development.
- Complex motor tasks requiring controlled processing are particularly challenging for individuals with PKU.
- Findings suggest a delayed maturation of motor control systems in PKU patients, influenced by phenylalanine exposure.